Time on website is 2 hours ahead or actual time

Can you explain that please?
I have the same “issue” (not that I care much about it), see Mapillary
In the exif tags it says
DateTime - 2017:05:11 11:42:32
DateTimeOriginal - 2017:05:11 11:42:32
DateTimeDigitized - 2017:05:11 11:42:32
GPSTimeStamp - 9 42 33

The time of the photo is CEST (+2), the GPS time is (UTC/GMT). Mapillary’s time is even +4 UTC, 13:42. So this doesn’t make sense to me.